Login

Join for Free!
119235 members


Archaea vs Bacteria

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

Moderator: BioTeam

Archaea vs Bacteria

Postby RLM222 » Mon Nov 10, 2008 9:40 pm

What is need to differentiate an archaea from bacteria? What kind of tests or materials? How are they generally differentiated?
RLM222
Garter
Garter
 
Posts: 5
Joined: Mon Nov 10, 2008 9:37 pm

Postby stopherlogic » Mon Nov 10, 2008 9:58 pm

Small subunit rRNA sequence analysis
stopherlogic
Death Adder
Death Adder
 
Posts: 80
Joined: Thu Sep 25, 2008 12:20 pm

Postby alextemplet » Tue Nov 11, 2008 6:00 pm

Ribosomal RNA is the primary method of differentiation, but there's also differences in how they live. Archaea are mostly extremophiles. It's believed that archaea are actually the ancestors of eukaryotes, and not bacteria.
Generally speaking, the more people talk about "being saved," the further away they actually are from true salvation.

~Alex
#2 Total Post Count
User avatar
alextemplet
King Cobra
King Cobra
 
Posts: 5599
Joined: Fri Dec 23, 2005 4:50 pm
Location: South Louisiana (aka Cajun Country)


Postby MrMistery » Wed Nov 12, 2008 12:11 am

There are many differences between Archea and Bacteria.
The fact that the rRNA sequence of the Archean 16S is closer to the eukaryotic 18S than to Bacterial 16S is indeed the way they were classified, but there many more differences.
The way they live - this is tricky, as (if my memory serves me) not all Archea are extremophiles and some Bacteria are extremophiles also.
Some more important distinctions include:
-archea have a different kind of cell wall that lacks murein, and some lack a cell wall entirely
-archea have a very different plasma membrane that is not a bilayer, but is instead composed of long branched carbon chains that have glycerol attached at both ends.
-glycerol in archean cell membranes is in a different stereoisomer than in every other cell
-archea have 3 RNA polymerases like eukaryotes, bacteria have only one
-there are numerous cases of introns in archea, whereas in bacteria these are very rare
-the two react to various antibiotics differently (don't remember which - look it up if you wish)

And to clear up something Alex said. Archea are not the ancestors of anything. It is true that it is believed that the ancestor of eukaryotes was an archean-like cell (the last common ancestor of archea and eukaryotes lived more recently than the last common ancestor of archea and bacteria), but it is very important to keep in mind that "Archea" refers to contemporary cells only.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)

Re: Archaea vs Bacteria

Postby rexacrouch » Sat Mar 07, 2009 2:32 am

This paper explains the difference between Archaea and Bacteria fairly well:

http://www.scribd.com/doc/13063682/A-Br ... -Industry-
rexacrouch
Garter
Garter
 
Posts: 1
Joined: Sat Mar 07, 2009 2:24 am

Postby canalon » Sun Mar 08, 2009 4:23 am

Just a note MrMistery,
Not all Archae have a single layered membrane. Some do some don't, but the link between the glycerol and the fatty acid is always an ether bond, unlike bacteria.
And yes there are a lot of bacterila extremophiles, and a lot of archae that are not extremophile, so this is not a good way to differentiate them.
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)
User avatar
canalon
Inland Taipan
Inland Taipan
 
Posts: 3909
Joined: Thu Feb 03, 2005 2:46 pm
Location: Canada

Postby MrMistery » Sun Mar 08, 2009 11:03 pm

ups yeah, I was a bit careless there. Could thing you caught that, we don't want to be misinforming people
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)


Return to Microbiology

Who is online

Users browsing this forum: No registered users and 1 guest